Download SOA and WS-BPEL: Composing Service-Oriented Solutions with by Yuli Vasiliev PDF
By Yuli Vasiliev
Whilst applied inside of a Service-oriented structure (SOA), net companies are a part of a company technique opting for the logical order of carrier actions logical devices of labor played by means of a number of companies. this day, the most well-liked software for organizing provider actions into enterprise techniques is internet companies enterprise technique Execution Language (WS-BPEL), a language defining an execution structure for enterprise approaches working on net companies. whereas it's not a trivial activity to outline a company procedure definition with WS-BPEL from scratch, utilizing a graphical WS-BPEL device can considerably simplify this procedure.
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Extra resources for SOA and WS-BPEL: Composing Service-Oriented Solutions with PHP and ActiveBPEL
Example text
When receiving an XML document of a specific structure from a consumer, a Web service wants to make sure that the received document has an appropriate structure, that is, the document conforms to a specific schema. To solve this problem, WSDL allows you to include XML Schema definitions describing the data structures being transmitted between the service provider and its consumers. In WSDL, you can either enclose XML Schema data type definitions within the types element or import an XML schema stored in a separate file using the import statement.
For example, if you bear the autonomy principle in mind when dividing application logic into services to be utilized within an SOA, you will have reusable, composable, and loosely coupled pieces of software that can be reused in future projects. On the other hand, ignoring at least one principle of service-orientation makes it very hard to keep up with the others. For example, if you ignore the principle of statelessness when designing services, you will end up with less reusable and less composable building blocks for your SOA solutions.
Of course, the above service would be only a part of an entire real-world solution. A service requestor sending a PO document for processing to this service would act as a service provider itself towards another requestor, or would be part of a composite service built, for example, with WS-BPEL. xml >